CN105259253B - A kind of phased array detection method of main inlet throttle-stop valve valve rod - Google Patents

A kind of phased array detection method of main inlet throttle-stop valve valve rod Download PDF

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Publication number
CN105259253B
CN105259253B CN201510753240.3A CN201510753240A CN105259253B CN 105259253 B CN105259253 B CN 105259253B CN 201510753240 A CN201510753240 A CN 201510753240A CN 105259253 B CN105259253 B CN 105259253B
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China
Prior art keywords
image
main inlet
inlet throttle
scanning
valve rod
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CN201510753240.3A
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CN105259253A (en
Inventor
冯云国
张丙法
刘广兴
朱广栋
张志彬
荆象阳
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
Shandong Electric Power Industrial Boiler Pressure Vessel Inspection Center Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
Shandong Electric Power Industrial Boiler Pressure Vessel Inspection Center Co Ltd
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Abstract

The invention discloses a kind of phased array detection methods of main inlet throttle-stop valve valve rod, including:The focusing parameter of phased array acoustic beam is set;Main inlet throttle-stop valve stem surface to be detected is fully smoothened into couplant;So that flexible probe and checked object surface is come into full contact with, along the main inlet throttle-stop valve valve rod circumferential direction uniform scanning, stores scan image;The image along main inlet throttle-stop valve valve rod circumferential direction scanning of storage is axially stacking, obtain final main inlet throttle-stop valve valve rod scanning image;Defect analysis is carried out to the obtained main inlet throttle-stop valve valve rod scanning image after the image of main inlet throttle-stop valve valve rod circumferential direction scanning and superposition.Advantageous effect of the present invention:It can realize that effective detection to main inlet throttle-stop valve stem internal defect, phased array imaging more can objectively reflect the size and shape of internal flaw existing for valve rod;The shortcomings that conventional surface method of inspection cannot effectively detect stem internal defect is overcome, prevents valve rod and occurs the failures such as fracture suddenly in use.

Description

A kind of phased array detection method of main inlet throttle-stop valve valve rod
Technical field
The present invention relates to a kind of phased array detection methods of main inlet throttle-stop valve valve rod.
Background technology
As generating set capacity constantly increases, the unit operation time is on the increase, steam turbine main inlet throttle-stop valve valve rod is asked The quantity and ratio of topic are on the increase, and are also constantly put forward higher requirements to main inlet throttle-stop valve valve rod quality detection technology in this way.
Currently table is mainly used to visit method to main inlet throttle-stop valve valve rod to test, wherein based on penetrant detecting method, infiltration Detection can only be detected stem surface defect, helpless for stem internal defect.For main inlet throttle-stop valve valve rod forging or The internal flaw generated during use, when being detected using conventional Ultrasound, since valve rod section radius is small, circumferential curvature is larger The problem of, all there is defective coupling in the no matter circumferential scanning of probe or axial scanning, detected so as to cause conventional Ultrasound It is constantly subjected to larger limitation.
Invention content
The purpose of the present invention is exactly to solve the above-mentioned problems, it is proposed that a kind of detect is suitable for different-diameter main inlet throttle-stop valve valve Bar ultrasonic phased array detection method, it is small, defective coupling that the method overcome radius of curvature existing for ultrasound examination valve rod Problem can make phased array imaging relatively sharp, improve detection sensitivity by the way that the depth of focus is arranged.
To achieve the goals above, the present invention adopts the following technical scheme that:
A kind of phased array detection method of main inlet throttle-stop valve valve rod, includes the following steps:
(1) focusing parameter of phased array acoustic beam is set so that sound beam focusing is at 1/2 stem diameter position;
(2) main inlet throttle-stop valve stem surface to be detected is fully smoothened into couplant;
(3) it places flexible probe by main inlet throttle-stop valve valve rod one end to be detected, make flexible probe and checked object table Face comes into full contact with, and along the main inlet throttle-stop valve valve rod circumferential direction uniform scanning one week, stores scan image;
(4) distance that a phased array probe wafer width is moved to another extreme direction of the main inlet throttle-stop valve valve rod, along described Main inlet throttle-stop valve valve rod circumferential direction uniform scanning one week stores scan image;
(5) step 4 is repeated, until valve rod scanning finishes;
(6) image along main inlet throttle-stop valve valve rod circumferential direction scanning of storage is axially stacking, obtain final main inlet throttle-stop valve valve Bar scanning image;
(7) to the obtained main inlet throttle-stop valve valve rod scanning image after the image of main inlet throttle-stop valve valve rod circumferential direction scanning and superposition into Row defect analysis.
The specific method of the step (7) is:
Flaw height and circumferential direction distance and defect place are measured on the image along main inlet throttle-stop valve valve rod circumferential direction scanning Specific location;
The axial direction length of defect is measured on axially stacking image;
Synthetic image pattern gives qualitative gradings to defect.
According to the picture position of scanning, pattern, trend and size, determines the stomata of stem internal, white point, fold, be mingled with With crack defect type;
If the image imaging of scanning is round and smooth, for oval or circular image, then it is judged as gas hole defect;
If the image of scanning is imaged as intensive dot, it is distributed at similar concentric circles, is then judged as white-spot defects;
If the image of scanning is wider, has the distribution on certain axial length direction, it is judged as fold defect;
If the image of scanning is irregular broken image, either large or small, edge is random, then is judged as being mingled with scarce It falls into;
If the image of scanning is to be imaged on two-dimensional directional, form is tortuous, without rule is moved towards, and wide middle, end are tiny, Then it is judged as crack defect.
The beneficial effects of the invention are as follows:
This method can realize that effective detection to main inlet throttle-stop valve stem internal defect, phased array imaging can more objectively Reflect the size and shape of internal flaw existing for valve rod;Stem internal cannot effectively be detected by overcoming the conventional surface method of inspection The shortcomings that defect, prevents valve rod and occurs the failures such as fracture suddenly in use.
Overcome that radius of curvature existing for ultrasound examination valve rod is small, defective coupling problem using flexible probe, it can be more preferable Imaging;The depth of focus of setting can make acoustic beam scanning range complete, keep phased array imaging relatively sharp, and it is sensitive to improve detection Degree.
While primary wave acoustic beam imaging is only used, more objectively complete it can react the inconsistent of valve rod internal structure Property, it for the image of defect, is superimposed according to the imaging of circumferential and axial, the complete pattern of defect can be observed, accurate positioning can Objectively to Flaw discrimination.
Description of the drawings
Fig. 1 is main inlet throttle-stop valve valve rod schematic diagram;
Fig. 2 is main inlet throttle-stop valve valve rod sectional view.
Wherein, 1 is flexible probe, and W is wafer width, and d is stem diameter, and A is active aperture.
Specific implementation mode:
The present invention will be further described with example below in conjunction with the accompanying drawings:
The invention discloses a kind of phased array detection methods of main inlet throttle-stop valve valve rod to include the following steps as shown in Figs. 1-2:
(1) focusing parameter of phased array acoustic beam is set so that sound beam focusing is at 1/2 positions stem diameter d;In 1/2d Place, imaging resolution highest, while ensureing the range complete imaging of acoustic beam scanning at stem surface to 1/2d.
(2) main inlet throttle-stop valve stem surface to be detected is fully smoothened into couplant;
(3) it places flexible probe by main inlet throttle-stop valve valve rod one end to be detected, make flexible probe and checked object table Face comes into full contact with, and along main inlet throttle-stop valve valve rod circumferential direction uniform scanning one week, stores scan image;Ultrasonic wave is overcome using flexible probe It detects existing for valve rod that radius of curvature is small, defective coupling problem, can more preferably be imaged.
(4) distance that a phased array probe wafer width W is moved to another extreme direction of main inlet throttle-stop valve valve rod, along main inlet throttle-stop valve valve Bar circumferential direction uniform scanning one week stores scan image;
(5) step (4) is repeated, until valve rod scanning finishes;
(6) image along main inlet throttle-stop valve valve rod circumferential direction scanning of storage is axially stacking, obtain final main inlet throttle-stop valve valve Bar scanning image;
(7) to the obtained main inlet throttle-stop valve valve rod scanning image after the image of main inlet throttle-stop valve valve rod circumferential direction scanning and superposition into Row defect analysis.Using phased array detection method, main inlet throttle-stop valve valve rod can be in uneven place's shape of ultrasonic wave acoustic beam scanning scope It is imaged at regular reflection.
Flaw height and circumferential direction distance and defect place are measured on the image along main inlet throttle-stop valve valve rod circumferential direction scanning Specific location;The axial direction length of defect is measured on axially stacking image;Synthetic image pattern gives defect qualitative Grading.
According to image space, pattern, trend, size etc., stomata, white point, the folding of accurate analysis stem internal may compare Fold, be mingled with, crackle the defects of, it is precisely and intuitive many in qualitative upper relatively analysis ordinary ultrasonic A wave wave modes reflection.
Stomata imaging is round and smooth, for oval or circular image;White point is molded intensive dot, most of at similar concentric circles point Cloth;Be folded into it is wider, have distributed image on certain axial length direction;It is mingled with for irregular broken image, it is either large or small, Edge is random;Crackle is generally on two-dimensional directional and is imaged, and form is tortuous, without rule is moved towards, and wide middle, end are tiny.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.

Claims (1)

1. a kind of phased array detection method of main inlet throttle-stop valve valve rod, characterized in that include the following steps:
(1)The focusing parameter of phased array acoustic beam is set so that sound beam focusing is at 1/2 stem diameter position;
(2)Main inlet throttle-stop valve stem surface to be detected is fully smoothened into couplant;
(3)Flexible probe is placed by main inlet throttle-stop valve valve rod one end to be detected, flexible probe and checked object surface is made to fill Tap is touched, along the main inlet throttle-stop valve valve rod circumferential direction uniform scanning one week, storage scan image;
(4)The distance that a phased array probe wafer width is moved to another extreme direction of the main inlet throttle-stop valve valve rod, along the main vapour Gate valve bar circumferential direction uniform scanning one week stores scan image;
(5)Repeat step(4), until valve rod scanning finishes;
(6)The image along main inlet throttle-stop valve valve rod circumferential direction scanning of storage is axially stacking, it obtains final main inlet throttle-stop valve valve rod and sweeps Look into image;
(7)The obtained main inlet throttle-stop valve valve rod scanning image after the image of main inlet throttle-stop valve valve rod circumferential direction scanning and superposition is lacked Fall into analysis;
The step(7)Specific method be:
Flaw height and circumferential direction distance are measured on the image along main inlet throttle-stop valve valve rod circumferential direction scanning and defect place is specific Position;
The axial direction length of defect is measured on axially stacking image;
Synthetic image pattern gives qualitative gradings to defect;
According to the picture position of scanning, pattern, trend and size, determines the stomata of stem internal, white point, folds, is mingled with and splits Line defect type;
If the image imaging of scanning is round and smooth, for oval or circular image, then it is judged as gas hole defect;
If the image of scanning is imaged as intensive dot, it is distributed at similar concentric circles, is then judged as white-spot defects;
If the image of scanning is wider, has the distribution on certain axial length direction, it is judged as fold defect;
If the image of scanning is irregular broken image, either large or small, edge is random, then is judged as inclusion defect;
If the image of scanning is to be imaged on two-dimensional directional, form is tortuous, without rule is moved towards, and wide middle, end are tiny, then sentence Break as crack defect.
CN201510753240.3A 2015-11-06 2015-11-06 A kind of phased array detection method of main inlet throttle-stop valve valve rod Active CN105259253B (en)

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CN106996956A (en) * 2016-01-22 2017-08-01 国核电站运行服务技术有限公司 The inservice inspection method of nuclear power station voltage-stabiliser tube adapter safe end bead crack

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CN103257183A (en) * 2013-04-01 2013-08-21 国家电网公司 Ultrasonic detection method for steam turbine rotor shaft equipped with center hole
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